A Static Magnetic Field of an MR Scanner Modulates Brain Activity
Yamamoto T, Toyomaki A
Hokkaido University School of Medicine
To investigate whether brainwaves are changed by the static magnetic field of a 1.5-T MR scanner, we monitored brainwaves inside and outside the MR scanner in different two days before and after demagnetization of the MR magnet. With our new method to remove the confounding influence of ballistocardiogram, we found that the frontal midline -wave significantly increased during an odd ball task only in the static magnetic field. In contrast, with or without the static magnetic field, no significant difference was observed for all brainwaves during rest condition. Our results suggest that the static magnetic field modulates brain activity.